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Lonsdale ThermGard Design · PDF filewind & snow loading Typical location ... BS6399:Part 3 - Loading for buildings ... BS CP3 Chapter V Part 2

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  • Lonsdale ThermGard Design Guide

    Introduction This Design Guide has been produced to assist specifiers and designers by illustrating typical installation details for sloped and vertical patent glazing. It is not exhaustive, but it does illustrate good practice for most applications and all details are in accordance with BS5516 for the design and installation of sloped and vertical patent glazing. Users of this guide must exercise all reasonable care to ensure that the details and products of Lonsdale Metal Company Limited are suitable for the intended purpose. If in doubt, ask us. Having decided to specify Lonsdale Patent Glazing, to save you valuable drafting time, CAD drawings of typical installation details are available on disk or from our website : www.roofglazing.co.uk If you require assistance please contact our Technical Department. Lonsdale Metal Company Limited, Millmead Industrial Centre, Mill Mead Road, London. N17 9QU Telephone : 020 8801 4221 Facsimile: 020 8801 1287 Contents

    Page

    Page

    Introduction

    1

    Guide to Selection of Glazing Bars

    2

    Cleaning and Maintenance

    3

    Recommended further reading

    3

    Maximum span between supports

    4 & 5

    Technical Summary

    6

    Typical Specification

    7

    Drawings & CAD Code Index

    8

    ThermGard CAD drawings

    9 to 34

    GlazaTherm

    35 to 40

    Research and Development

    41

    www.roofglazing.co.uk Page 1

    PRINT OUT THIS DESIGN GUIDE FOR REFERENCE IF YOU WISH.

    CLICK THE Pages TAB TO SEE THUMBNAILS OF ALL THE PAGES IN THE PUBLICATION. TO PRINT OUT INDIVIDUAL PAGES, CLICK

    File, Print THEN CHECK Current page OR SELECT Pages RANGE AND CLICK OK.

    TO PRINT DRAWINGS TO THE SCALE INDICATED YOUR PRINT DRIVER MUST BE

    CAPABLE OF BEING SET AT 100%. LOOK IN YOUR PRINTERS Properties FOR SETTINGS. CONTACT OUR TECHNICAL DEPARTMENT

    FOR FURTHER ADVICE.

  • Guide to the Selection of Glazing Bars Scope The data given indicates the maximum unsupported spans for the range of Lonsdale Patent Glazing Bars when subjected to the three combined loading conditions of 800, 1200 and 1800 N/ m. They are broadly defined in Table 1 alongside typical site locations for these loadings. Tables 2 and 3 respectively (pages 4 and 5) give the spans for bars carrying single and double glazing; they cover different double pitch roof angles and vertical glazing. Standards The data has been calculated using the following Standards : BS6399:Part 3:1988 British Standard loading for buildings Code of practice for imposed loads. BS5516:1991 Code of practice for the design and installation of patent glazing. BSCP3:Chapter V: Part 2:1972 Code of basic data for the design of buildings - wind loads. Loadings Combinations of wind and snow loadings, together with the self-weight of bars and glass, have been considered in determining the maximum bar spans. Surface and local wind pressure coefficients (the latter relating to the higher loaded areas on the roof edges and wall comers - see the shaded area of fig 1), are both taken into consideration. Likewise, the effects of uniform and asymmetric snow loading are also included. Fig1 Local high load areas (shaded) on the roof and wall glazing Location and Site Conditions Table 1

    Maximum eaves height

    Basic wind speed

    Dynamic wind pressure

    Basic snow loading

    Combined wind & snow loading

    Typical location

    m m/s N/m N/m N/m City centre

    4.0 44 400 400 800

    Outskirts of large city

    5.0 46 650 550 1200

    Open country

    6.0 50 1250 550 1800

    Page 2

  • Guide to the Selection of Glazing Bars - continued Limitations Tables 2 and 3 (pages 4 and 5 are restricted to :

    Glazed walls and double pitched roofs of rectangular clad buildings of height / width ratios up to 6 : 1 and length / width ratios up to 4 :1.

    Two edge support of glass on bars spaced at 600mm. Single glazing using 6mm polished or 7mm wired cast glass. Hermetically sealed double glazed units, with 6mm thick float, toughened or

    laminated glass in any combination. Failure Conditions The glazing bar spans given will not fail due to either excessive deflection or stressing of the components, in accordance with the above standards. Technical Support Care should be taken in applying the above data to different site locations, conditions, building size or roof types (including canopies ). In such instances, Lonsdale Metal Company will be pleased to give further advice, upon request. Cleaning and Maintenance Recommended procedures can be found on our website www.roofglazing.co.uk and in BS5516 - Code of practice for the design & installation of sloping and vertical patent glazing. In addition, if materials are coated with an architectural finish e.g. polyester powder paint, advice should be sought from the manufacturers / applicator of the process. Recommended further reading BS5516 - Code of practice for the design & installation of sloping and vertical patent glazing BS6399:Part 3 - Loading for buildings - Code of practice for imposed loads BS CP3 Chapter V Part 2 - Code of basic data for the design of buildings - Wind loads NBS Specification H10 Patent Glazing

    Page 3

  • Guide to the Selection of Glazing Bars - continued Maximum span between supports (metres) NB: The overall bar length may exceed these values in order to provide and overhang at the eaves and/or ridge. Single Glazed Bars Table 2

    Combined basic wind & snow loading

    Angle of Glazing relevant to the horizontal

    N/m

    Glazing Bar

    15 22.5 30 45 60 Vertical ALM100/1 3.34 3.44 3.43 3.49 3.49 3.40 ALM100/2 4.15 4.27 4.26 4.33 4.34 4.23 ALM100/3 4.67 4.89 4.88 4.96 4.98 4.87 ALM100/4 5.33 5.55 5.54 5.64 5.66 5.55 ALM100/5 Span between supports on application ALM100/H6 3.38 3.49 3.48 3.53 3.54 3.44 ALM100/H7 4.49 4.71 4.70 4.78 4.80 4.69

    800

    ALM100/H8 Span between supports on application ALM100/1 2.79 3.03 3.02 3.22 3.17 3.03 ALM100/2 3.59 3.77 3.75 4.00 3.94 3.76 ALM100/3 4.04 4.36 4.34 4.60 4.53 4.34 ALM100/4 4.61 4.97 4.95 5.22 5.15 4.94 ALM100/5 Span between supports on application ALM100/H6 2.85 3.06 3.05 3.26 3.21 3.06 ALM100/H7 3.89 4.20 4.18 4.43 4.37 4.18

    1200

    ALM100/H8 Span between supports on application ALM100/1 1.90 2.07 2.06 2.37 2.34 2.18 ALM100/2 2.77 3.02 3.01 3.32 3.30 3.17 ALM100/3 3.34 3.58 3.57 3.83 3.80 3.66 ALM100/4 3.80 4.08 4.07 4.36 4.32 4.17 ALM100/5 Span between supports on application ALM100/H6 1.94 2.12 2.11 2.43 2.39 2.23

    1800

    ALM100/H7 3.16 3.45 3.44 3.69 3.66 3.53

    Page 4

  • Guide to the Selection of Glazing Bars - continued Maximum span between supports (metres) NB: The overall bar length may exceed these values in order to provide and overhang at the eaves and/or ridge. Double Glazed Bars Table 3

    Combined basic wind & snow loading

    Angle of Glazing relevant to the horizontal

    N/m

    Glazing Bar

    15 22.5 30 45 60 Vertical ALM100/1 2.12 2.07 2.07 2.16 2.22 2.23 ALM100/2 3.27 3.19 3.19 3.31 3.35 3.36 ALM100/3 3.75 3.71 3.71 3.80 3.85 3.87 ALM100/4 4.26 4.22 4.22 4.31 4.38 4.41 ALM100/5 Span between supports on application ALM100/H6 2.17 2.12 2.12 2.21 2.27 2.28 ALM100/H7 3.62 3.58 3.58 3.66 3.71 3.73

    800

    ALM100/H8 Span between supports on application ALM100/1 1.70 1.89 1.87 1.89 1.86 1.76 ALM100/2 2.63 2.92 2.88 2.90 2.87 2.72 ALM100/3 3.30 3.55 3.54 3.55 3.53 3.45 ALM100/4 3.76 4.04 4.03 4.04 4.02 3.93 ALM100/5 Span between supports on application ALM100/H6 1.75 1.93 1.91 1.93 1.91 1.81 ALM100/H7 3.18 3.42 3.42 3.42 3.40 3.32

    1200

    ALM100/H8 Span between supports on application ALM100/1 1.13 1.24 1.23 1.42 1.38 1.26 ALM100/2 1.75 1.91 1.90 2.19 2.14 1.95 ALM100/3 2.68 2.89 2.88 3.09 3.05 2.91 ALM100/4 3.06 3.29 3.28 3.52 3.47 3.31 ALM100/5 Span between supports on application ALM100/H6 1.15 1.26 1.26 1.44 1.41 1.29

    1800

    ALM100/H7 2.59 2.78 2.78 2.98 2.94 2.81

    Page 5

  • Technical Summary Patent Glazing Bars Specification Glazing Bars, Cappings, Beads and Fittings are extruded aluminium alloy 6063-T6 to BS1474. Fasteners provided are either stainless steel to BS304515 Grade A2 or mild steel bright zinc plated. Gaskets are extruded Thermo Plastic Rubber quality 98625 to BS4255:Part1:1986 Grade C. Performance All systems are designed to conform with the requirements of BS5516 when installed within the manufacturers recommendations. A guide to maximum spans is given on page 4 of the Design Guide and should be referred to prior to planning an installation. Fixing Fixing to timber is directly through the channels at the top of the glazing bars with two No. 10 x 1.5 inch bright zinc plated wood screws and a sliding shoe with wood screws at the bottom end. Fixing to metal is with M8 Single Hole Fixing Shoes positively fixed at the top and sliding at the bottom end. Dissimilar metals should be isolated to avoid bi-metallic corrosion Appearance Materials are supplied Mill Finished as standard. A range of architectural finishes is available including polyester powder coating to BS6496 in standard RAL or BS colour ranges. Ventilation May be achieved either through GlazaTherm, our top hung roof ventilator, or by casement vents in vertical applications. Various factory fitted opening mechanisms are available including manual, pole or cord operated, electrical,

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